Revert "tls proxy: immediately close a connection to the backend"

This reverts commit e0a37cf21e43fbb4ba3f9f8fa5321a0a0e1bedf1.

This didn't help fixing bug #1630664. Issue seems to be between
client<--->Apache2, not between Apache2<--->eventlet

Change-Id: I092c1bbf0c5848b50fc9e491d1e9211451208a89
diff --git a/lib/tls b/lib/tls
index d96ca4f..57b5e52 100644
--- a/lib/tls
+++ b/lib/tls
@@ -520,7 +520,7 @@
     SSLCertificateFile $DEVSTACK_CERT
 
     <Location />
-        ProxyPass http://$b_host:$b_port/ retry=5 disablereuse=on keepalive=off nocanon
+        ProxyPass http://$b_host:$b_port/ retry=5 nocanon
         ProxyPassReverse http://$b_host:$b_port/
     </Location>
     ErrorLog $APACHE_LOG_DIR/tls-proxy_error.log